Valve grinder



E. H. HOWARD.

VALVE GRINDEB.

mamon man Aucas. ma

Patentd Nov. 14, 1922.

/7 mno o\oen one o o o o no za 74 ,IU

I LJ

Patented Nov. 14, 1922.

UNITED STATES PATENT OFFICE.

EARL H. HOWARD, OF LOS ANGELES, CALIFORNIA, ASSIGNOR T0 GILFILLAN BROS.

SMELTING & REFINING COMPANY, OF LOS ANGELES, CALIFORNIA,

TION OF CALIFORNIA.

A CORPORA- VALVE GRINDER.

Application filed August 8, 1919.r Serial No. 316,049.

To all 'whom t -flf'iay camera.'

Be it known that I, EARL H. HOWARD, a citizen of the United States,residing at Los Angeles, in the county of Los Angeles, State ofCalifornia, have invented new and usel fui Improvements in ValveGrinders, ot which the following is a specification.

This invention relates to valve grinding machines and particularly tovalve grinding machines adapted to be used forvgrinding in poppet valvessuch as are used in internal combustion engines common m automobilepractire. lt is an object of the invention to provide a simple, compactand efl'estive machine of this character.

In order that poppet valves be tight they must be iliade to seatproperly.r Valves of this type are generally made to seat tightly andproperly by grinding them in with emery. This grinding in is generallydone by placing a compound of emery between the valve and the valve seatand then giving the valve an oscillating rotating motionl by means of a.screw-driver or the like. The reason for giving the valve anoscillating, rotating motion-that is, :i motion so that it rotatesthrough a small angle in one direction and then rotates through a Smallangle in the other direction, is because continuous rotation of thevalve in one direction will cause rings or grooves to form either in thevalve seat or in the valve itself. The grinding in oi" valves by hand isslow and laborious and is therefore expensive. By the present inventionan electrically driven machine is provided which will properly grind ina valve in a fraction of the time required to do .it by hand. I l

The present invention provides a machine in which an electric motor,through a suitable mechanism, gives an oscillating, rotative motion,such as is required for grinding in a valve` to a shaft. This shaftwhich is driven bythe motor is adapted to have a member attached to itwhich will engage a valve so as to cause it to be driven by said shaft.

A particular feature of the invention is the compactness and simplicityof the mechanism. which gives the required motion to the shaft. Thecompactness of the mechanism makes the machine easy to handle while thesimplicity minimizes the danger of parts getting out of order andthereby makes the i machine particularly durable.

Further objects and features of the invention willbe readily understoodfrom the following detailed description of a referred orm of theinvention in which re erence is had to the accompanying drawings inwhich` "Fig, is a side elevation of the machine; 111g. is an enlargeddetail section taken as indicated by lines 2-2 on Fig. 1; Fig. 3 is adetail section taken as indicated by line on Fig. ,2; Fig. 4 is a detailsection taken as indicated by .line 4 4 on F ig. 3; Fig. 5 `is a detailsection taken as indicated by line 5-5 on Fig. 2; and Fig. 6 is a detailsection taken as indicated by line 6-6 on Fig 5.

.l'hroughout the drawings numeral 10 designates the casing of themachine in which is carried an electric motor. The casing 10 lispreferably shaped as shown in Fig. 1 so as to form a handle 11 whichprovides a convenient means for handling the machine. A portion 12 ofthe casing in which there is a .switch is preferably provided near thehandle 11, and a button 13 for operating the switch in portion 12 may belocated so that it may be conveniently operated from the handle 11. Leadwires 14 enter the inachiiie throng-jh :i conductor 15 and the currententering the machine through lead wires 14 is controlled by the switchinthe portion 12.

` Suitable veiitilatiiig holes 16 and 17 may be rprovided in the casing10 to allow a circulation of air around the motor within said casing toprevent it from becoming overheated. The shape, arrangement andproportions of the casing 10 may be varied to suit conditions but it ispreferred that they be substantially as shown in the drawings. The shaft18, of the motor which is within the casing 10, extends'fr'oin thebottom 19 of said casing 10, and has mounted on .it a pinion 20. Thepinion 20 engages and drives a gear 21 which is mounted on a pivot pin22. The pivot pin 22 is mounted in and extends from the bottom 19 of thecasing 10. Formed integral with the gear 21 and therefore driven by saidgear there is a pinion arranged as shown in Fig. 3. The pinion 23engages and drives a large gear 24 which is mounted on a pivot pin 25.The pivot

